spm
shockwave
I have used powerburst , blitz Etc on my own carpets and they re soil 4 x as quick as spm and shockwave if its not good enough for me why should it be for my customers , and yes i did acid rinse
I always test on my own carpets, can't say i've noticed any difference in the resoiling values, My regular customers i go to, most are clean or cleanish when i get there( I like customers like that

) starting to get some customers coming back where i used spm, same again clean or cleanish, just the odd stain here and there!!! Agree with Simon, bit of a sweeping statement!!!!
Think everyone gets used to the chemicals they use!!! I'm awful for keep buying different ones to try, but always seem to go back to what i find works for me! If they don't work for you, Thats fine, be a boring life if we we're all the same!!!

But for me, i've never really had an issue, especially the one you've said you've found!!!!